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CVE-2025-68313 (GCVE-0-2025-68313)

Vulnerability from cvelistv5 – Published: 2025-12-16 15:39 – Updated: 2026-09-02 12:49
VLAI
Title
x86/CPU/AMD: Add RDSEED fix for Zen5
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/CPU/AMD: Add RDSEED fix for Zen5 There's an issue with RDSEED's 16-bit and 32-bit register output variants on Zen5 which return a random value of 0 "at a rate inconsistent with randomness while incorrectly signaling success (CF=1)". Search the web for AMD-SB-7055 for more detail. Add a fix glue which checks microcode revisions. [ bp: Add microcode revisions checking, rewrite. ]
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3e4147f33f8b647775357bae0248b9a2aeebfcd2 , < e980de2ff109dacb6d9d3a77f01b27c467115ecb (git)
Affected: 3e4147f33f8b647775357bae0248b9a2aeebfcd2 , < 36ff93e66d0efc46e39fab536a9feec968daa766 (git)
Affected: 3e4147f33f8b647775357bae0248b9a2aeebfcd2 , < 607b9fb2ce248cc5b633c5949e0153838992c152 (git)
Affected: 5953e7a89966fc5a42124a08ba33a9c57ba5173c (git)
Affected: 6.6.156 , < 6.7 (semver)
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Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Add RDSEED fix for Zen5\n\nThere\u0027s an issue with RDSEED\u0027s 16-bit and 32-bit register output\nvariants on Zen5 which return a random value of 0 \"at a rate inconsistent\nwith randomness while incorrectly signaling success (CF=1)\". Search the\nweb for AMD-SB-7055 for more detail.\n\nAdd a fix glue which checks microcode revisions.\n\n  [ bp: Add microcode revisions checking, rewrite. ]"
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          },
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              "value": "AV:L - The affected RDSEED forms are directly executable by local user-space code; no syscall or network packet directly reaches the primitive.\nAC:L - An attacker can create the demonstrated RDSEED and memory-pressure workload using concurrent threads, so the triggering conditions are attacker-controlled.\nPR:L - An ordinary unprivileged process can execute RDSEED and induce contention without capabilities, root access, or namespace privileges.\nUI:N - Exploitation requires no action by a human victim once affected software consumes RDSEED-derived entropy.\nS:U - The impact remains within the affected host or guest security authority, with no demonstrated guest-to-host escape or other scope crossing.\nC:H - Predictable seed material can compromise cryptographic private keys, session keys, or nonces, potentially exposing all data protected by them.\nI:H - Compromised signing, authentication, or encryption keys can enable impersonation, forgery, and unauthorized modification of protected data.\nA:N - The flaw degrades entropy but does not directly corrupt memory, crash the kernel, hang execution, or exhaust resources."
            }
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        "dateUpdated": "2026-09-02T12:49:29.117Z",
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        "shortName": "Linux"
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        },
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    "datePublished": "2025-12-16T15:39:43.972Z",
    "dateReserved": "2025-12-16T14:48:05.295Z",
    "dateUpdated": "2026-09-02T12:49:29.117Z",
    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/CPU/AMD: Add RDSEED fix for Zen5\n\nThere\u0027s an issue with RDSEED\u0027s 16-bit and 32-bit register output\nvariants on Zen5 which return a random value of 0 \"at a rate inconsistent\nwith randomness while incorrectly signaling success (CF=1)\". Search the\nweb for AMD-SB-7055 for more detail.\n\nAdd a fix glue which checks microcode revisions.\n\n  [ bp: Add microcode revisions checking, rewrite. ]"
          }
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        "lastModified": "2026-09-02T13:17:01.690",
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      "version": "3"
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      "current_release_date": "2026-09-12T16:44:45Z",
      "cve": "CVE-2025-68313",
      "id": "CVE-2025-68313",
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      "product_status:recommended": "384",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-68313",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-68313.json",
      "version": "37"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.